Acids and Bases
Acids and Bases is a Science & Technology concept from the MPSC syllabus, tested in 2 past MPSC questions (2023, 2024). Below are those real questions with their correct answers and explanations, plus the concepts worth being comfortable with first.
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0.10M जलिय HCl द्रावणाचा pH काढण्यासाठी खालीलपैकी कोणता गणितीय संबंध वापरावा ? Which of the following mathematical relationships should be used to calculate the pH of a 0.10M aqueous HCl solution ?
pH is defined as the negative logarithm of hydrogen ion concentration: pH = -log10[H+]. For 0.10M HCl, [H+] = 0.10 or 1.0 x 10⁻¹ M, giving pH = -log10(1.0 x 10⁻¹).
रासायनिक खतांच्या अतिवापरामुळे शेतजमिनीतील वाढलेल्या अम्लाचे उदासिनीकरण करण्यासाठी कोणते रसायन वापरतात ? / Which chemical compound is used to neutralize the acidity of soil increased due to excessive use of Chemical Fertilizers ?
(a)पोटेश / Potash
(b)चुन्याची निवळी / Lime water
(c)मिल्क ऑफ मॅग्नेशिया / Milk of magnesia
(d)अमोनियम हायड्रॉक्साइड / Ammonium hydroxide
Lime water (calcium hydroxide) or agricultural lime is basic in nature and is used to neutralize the excess acidity in soil caused by overuse of chemical fertilizers.